1 at a time wouldn’t get you a noticeable amount of energy for a bomb (stuff is radioactively decaying around you already right now). A scientist might make some use of it, but with control of only 1 atom at a time they’ll struggle to build really any molecule as I imagine most intermediate molecules would break apart as soon as you “let go” to grab the next atom.
You can control only 1 at a time.
You’d be surprised what a small team at a large corporation will do if it lets them complete a project within budget. The PlayStation 3 originally allowed users to install custom operating systems. A lot of groups, even the US military, bought thousands of them because they were inexpensive computers (sold at a loss) and used them for compute projects. Sony eventually stripped out the functionality in an update, presumably because they wanted to cut out this type of buyer.
I assumed as fast as you can think the command for each one.
I agree with feeling being useful for feeling around; I’m happy with the power having some value.